Messages in this thread | | | Date | Wed, 19 Sep 2007 20:29:07 +0100 (BST) | From | Hugh Dickins <> | Subject | Re: [PATCH -mm] Don't truncate /proc/PID/environ at 4096 characters |
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On Wed, 19 Sep 2007, Mikael Pettersson wrote: > H. Peter Anvin writes: > > Mikael Pettersson wrote: > > > Does /proc/PID/mem even work? If I do `strace cat /proc/PID/mem > /dev/null' > > > for a known good PID, the first read() from /proc/PID/mem fails with ESRCH, > > > > Of course it does. Address zero isn't typically mapped. > > Indeed. My bad :-(
No, not quite. Peter explains why "cat /proc/self/mem" gets EIO, but you were seeing "cat /proc/other/mem" get ESRCH: that's from the stringent !MAY_PTRACE || !ptrace_may_attach checks.
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